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From 6aebc271d95f9c59cb63c923b6ce35f16fce10e4 Mon Sep 17 00:00:00 2001
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From: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Date: Mon, 16 Jan 2023 07:17:23 -0500
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Subject: [PATCH 30/31] KVM: keep track of running ioctls
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RH-Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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RH-MergeRequest: 138: accel: introduce accelerator blocker API
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RH-Bugzilla: 1979276
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [2/3] f566f81dda26ae733008f32261ecd1253ec1796d (eesposit/qemu-kvm)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1979276
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commit a27dd2de68f37ba96fe164a42121daa5f0750afc
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Author: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Date: Fri Nov 11 10:47:57 2022 -0500
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KVM: keep track of running ioctls
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Using the new accel-blocker API, mark where ioctls are being called
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in KVM. Next, we will implement the critical section that will take
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care of performing memslots modifications atomically, therefore
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preventing any new ioctl from running and allowing the running ones
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to finish.
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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Message-Id: <20221111154758.1372674-3-eesposit@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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---
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accel/kvm/kvm-all.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
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index f99b0becd8..ff660fd469 100644
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--- a/accel/kvm/kvm-all.c
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+++ b/accel/kvm/kvm-all.c
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@@ -2310,6 +2310,7 @@ static int kvm_init(MachineState *ms)
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assert(TARGET_PAGE_SIZE <= qemu_real_host_page_size());
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s->sigmask_len = 8;
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+ accel_blocker_init();
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#ifdef KVM_CAP_SET_GUEST_DEBUG
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QTAILQ_INIT(&s->kvm_sw_breakpoints);
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@@ -3014,7 +3015,9 @@ int kvm_vm_ioctl(KVMState *s, int type, ...)
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va_end(ap);
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trace_kvm_vm_ioctl(type, arg);
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+ accel_ioctl_begin();
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ret = ioctl(s->vmfd, type, arg);
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+ accel_ioctl_end();
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if (ret == -1) {
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ret = -errno;
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}
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@@ -3032,7 +3035,9 @@ int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
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va_end(ap);
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trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg);
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+ accel_cpu_ioctl_begin(cpu);
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ret = ioctl(cpu->kvm_fd, type, arg);
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+ accel_cpu_ioctl_end(cpu);
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if (ret == -1) {
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ret = -errno;
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}
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@@ -3050,7 +3055,9 @@ int kvm_device_ioctl(int fd, int type, ...)
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va_end(ap);
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trace_kvm_device_ioctl(fd, type, arg);
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+ accel_ioctl_begin();
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ret = ioctl(fd, type, arg);
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+ accel_ioctl_end();
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if (ret == -1) {
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ret = -errno;
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}
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--
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2.31.1
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